Today I can’t enter the Arena. It just load and keep me in the first page.
It let me enter Arena and at end of the battle it froze. I had to turn my phone off and then back on and reload game. Now it wont let me in the arena at all either. 
Same for me! I haven’t been allowed in the arena for nearly 2 days.
I already can enter the arena. I can enter the arena since I update the game on Google Play. I must go to Google Play and update it through Google Play.